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authorEric Dumazet <dada1@cosmosbay.com>2008-11-16 19:40:17 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-16 19:40:17 -0800
commit3ab5aee7fe840b5b1b35a8d1ac11c3de5281e611 (patch)
tree468296b7be813643248d4ca67497d6ddb6934fc6 /net/ipv4/tcp.c
parent88ab1932eac721c6e7336708558fa5ed02c85c80 (diff)
net: Convert TCP & DCCP hash tables to use RCU / hlist_nulls
RCU was added to UDP lookups, using a fast infrastructure : - sockets kmem_cache use SLAB_DESTROY_BY_RCU and dont pay the price of call_rcu() at freeing time. - hlist_nulls permits to use few memory barriers. This patch uses same infrastructure for TCP/DCCP established and timewait sockets. Thanks to SLAB_DESTROY_BY_RCU, no slowdown for applications using short lived TCP connections. A followup patch, converting rwlocks to spinlocks will even speedup this case. __inet_lookup_established() is pretty fast now we dont have to dirty a contended cache line (read_lock/read_unlock) Only established and timewait hashtable are converted to RCU (bind table and listen table are still using traditional locking) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f60a5917e54..044224a341e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2707,8 +2707,8 @@ void __init tcp_init(void)
thash_entries ? 0 : 512 * 1024);
tcp_hashinfo.ehash_size = 1 << tcp_hashinfo.ehash_size;
for (i = 0; i < tcp_hashinfo.ehash_size; i++) {
- INIT_HLIST_HEAD(&tcp_hashinfo.ehash[i].chain);
- INIT_HLIST_HEAD(&tcp_hashinfo.ehash[i].twchain);
+ INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i);
+ INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].twchain, i);
}
if (inet_ehash_locks_alloc(&tcp_hashinfo))
panic("TCP: failed to alloc ehash_locks");